The Fellowes AeraMax 90 Is Rated for 90 Square Feet and Sold for 200
The number in the name is the room size Fellowes prints in its own manual. Every shop doubles it.
The numbers
- Certified smoke CADR: 71. Dust 65, pollen 87, all AHAM Verifide
- Room size in the manual: 90 sq ft. On the listings: 100 to 200 sq ft
- Air changes an hour: 5.9 at 90 sq ft, 2.7 at 200
- Price: $160.55 to $262.99, checked 6 August 2026
- Filters: $121.74 over three years, against a $160 machine
- Noise: 42, 50 and 60 dB across three speeds
- Warranty: 3 years
- The AeraMax 100 and DX5 are the same machine with different numbers on them
Verdict
Worth it if your room is under about 110 square feet and you already own one. Inside that size it does the job properly, at close to six air changes an hour, with a genuine HEPA filter and a certification you can look up.
Fellowes has taken the whole consumer AeraMax line off its own website, so you would be buying a discontinued product from three small dealers. The room size on the box is also roughly double what the machine is certified for, which means a lot of people have bought this for a living room it was never going to handle.
If you own one already, the filters are cheap and plentiful, and the part numbers are further down this page.
The model number is the honest number
Fellowes’ manual for the AeraMax 90 states the coverage as “Room Area Served 90 sq. ft./8 sq. m.” Walmart, Office Depot, OfficeSupply, Staples and two more dealers all describe the same machine as suiting rooms of 100 to 200 square feet.
The manual is right, and it is right for a reason. AHAM publishes a formula in its own white paper: suggested room size equals 1.55 times the smoke clean air delivery rate. This unit is certified at 71, and 1.55 times 71 comes to 110 square feet. Round that down and you have the number Fellowes stamped on the front of the box as a model name.
The naming convention holds right up the range, and one detail gives the game away. The AeraMax 190 manual says “190 sq. ft./18 sq. m.” Its sibling the 200 says “200 sq. ft./18 sq. m.” But 190 square feet is 17.7 square metres and 200 is 18.6. Only one of those rounds to 18. Somebody edited the imperial figure and left the metric one where it was.
What doubling the room costs you
Clean air delivery rate is a flow. Divide it into a room and you get air changes per hour, which is the figure that actually decides whether a purifier keeps up with a room or falls behind it. At 71 cubic feet a minute the AeraMax 90 moves 4,260 cubic feet an hour.
In the 90 square feet Fellowes certified, that comes to 5.9 air changes an hour. Stretch the same machine across the 200 square feet the listings promise and it drops to 2.7. Everyone in the field works to a threshold of five, which AHAM’s own paper attributes to the CDC.
So a buyer with a 200 square foot living room, reading the box, gets a machine doing a little over half the work they think they are paying for. Nobody has to lie for that to happen. Both numbers are published, in documents from the same company, and the gap sits between them.
The 90, the 100 and the DX5 are one machine
AHAM lists all three with the same certified numbers, down to the digit. Fellowes’ own support pages collapse them into single rows, one for clean air delivery and one for noise. They take the same True HEPA filter, part 9287001, and the same carbon pre-filter, part 9324001.
Useful to know when you are shopping, because a listing for a “DX5” and a listing for a “90” are competing on price for identical hardware.
You are buying a discontinued product
Fellowes’ air quality catalogue now shows five machines, all of them commercial AeraMax Pro units, plus the networked Array range. No consumer model appears anywhere on it. Fellowes has never used the word discontinued, and its old product page still loads, but the page renders through JavaScript and gives up nothing to read.
The dealers are blunter. WebstaurantStore’s listing says “This product is no longer available. We’ve left this page up for reference only.” Quill, MyBinding and OfficeCrave have retired the SKU and bounce you to a category. OfficeSupply is sold out. Walmart is out of stock.
Three sellers still had it, all of them small business suppliers, and Staples had it in stores only.
The filters cost about as much as the machine
The True HEPA filter runs twelve months and the activated carbon pre-filter runs three, which means four carbon filters and one HEPA every year. Sourced at Home Depot that is $23.95 and $16.63 for a four-pack, so $40.58 a year, or $121.74 over three.
Buy the machine at $160.55 and the filters have cost you roughly what the machine did before you reach year four. Your choice of filter shop moves that figure further than your choice of model does. The same HEPA filter that is $23.95 at Home Depot is $35.99 at Sylvane.
The carbon pre-filter is not optional in any real sense, because it is the part doing the odour and smoke work the product is sold on.
Where it was actually in stock
Paper Machines, $160.55 Clary, $160.55 ASLegal, $262.99
The filters, which are easier to get than the machine
True HEPA 9287001, $23.95 Carbon 9324001 four-pack, $16.63
All checked on 6 August 2026. None of these links pays me anything.
The ionizer is on when it arrives
PlasmaTRUE is Fellowes’ ionizing stage, and on the home and office units it is switched on out of the box. The commercial units ship with it off. To turn it off you hold the PlasmaTRUE icon for five seconds until the unit beeps, which is in the troubleshooting table rather than the setup instructions.
It makes a noise. Fellowes lists that under faults so people stop worrying: the faint ticking sound “indicates that the PlasmaTRUE™ function is working.” Two review sites report owners finding the crackle irritating enough to leave the feature off.
On ozone, Fellowes says testing found a peak of 4.0 parts per billion against an acceptable level of 50, tested under UL 867 in July 2013. That figure covers the whole AeraMax family rather than this model, and I could not find an independent measurement of any of them.
What is wrong with it
Drawbacks
- Sold for a room twice the size it is certified for. Source: Fellowes’ own manual against Fellowes’ own retail copy, adjudicated by the AHAM directory
- Discontinued, with three small dealers left. Source: absence from Fellowes’ current catalogue, and WebstaurantStore’s “no longer available” notice
- Three years of filters cost about what the machine costs. Source: Home Depot pricing on both part numbers against the cheapest dealer price
- The ionizer ships switched on and the off switch is not in the setup section. Source: Fellowes’ support FAQ and the manual’s troubleshooting table
- No UL file number is published. Source: Fellowes asserts UL certification in prose, four dealers repeat it, and the manual carries no certification mark at all
- Two dealers advertise CARB certification that is not in CARB’s register. Source: the California register searched directly, twice, with no Fellowes or AeraMax entry. CARB’s draft list could not be checked, so treat this as unverified rather than refuted
- The allergy certification belongs to a different product line. Source: the AAFA record covers AeraMax Professional. No record names the consumer 90
- The unit looks dead after a filter change. Source: the manual’s own troubleshooting entry for filter indicators staying lit, plus owner reports where the filter was not fully seated
- The panel lights cannot be dimmed. Source: a review site noting no sleep mode on a machine designed for a bedroom
- Where it is built is stated only by dealers. Source: OfficeSupply and ASLegal both say China. Fellowes’ manual gives only its Illinois head office, and no importer of record
What holds up
- Genuine True HEPA, defined by Fellowes at 99.97 percent down to 0.3 microns, with an antimicrobial treatment on the media
- AHAM Verifide, so the performance number is third-party and you can look it up
- An air quality sensor that adjusts fan speed on its own, which the smallest model in a range often loses
- A clean CPSC record. Four separate queries came back empty
- Filters still in production, still cheap, and shared with two other model numbers
Questions people ask
What size room does the AeraMax 90 actually cover?
About 90 to 110 square feet. Fellowes’ manual says 90, AHAM’s directory says 100, and AHAM’s own formula gives 110. The 200 square feet on the listings is roughly double what the certification supports.
Is the AeraMax 90 the same as the 100 or the DX5?
Yes. Identical certified performance, identical filters, three part numbers.
Which filters does it take?
True HEPA 9287001 once a year, and carbon 9324001 every three months, sold in fours.
My AeraMax will not turn on after I changed the filter.
Check the filter is fully seated before anything else, then reset the filter indicators using the instructions on page 10 of the manual. This is the most common report I found, and it looks exactly like a dead unit.
Can I turn the ionizer off?
Hold the PlasmaTRUE icon for about five seconds until it beeps. It arrives switched on.
Is it still made?
No. The consumer AeraMax range has gone from Fellowes’ catalogue. The filters are still made and easy to buy.
The same arithmetic run across the 190 and 290, plus the filter part numbers and prices, is on the air care hub.
Sources
- Fellowes AeraMax 90 operator manual, the source for the 90 sq ft room area, the True HEPA and AeraSafe description, the filter part numbers and intervals, the sensor colours and the three year warranty
- AHAM Directory of Certified Portable Electric Room Air Cleaners, October 2023, the source for the certified 65 dust, 71 smoke and 87 pollen figures and the 100 sq ft room size, and for the AeraMax 100 and DX5 carrying identical numbers. The April 2020 edition lists 65, 68 and 75, which is what the 2021 manuals still quote
- AHAM, Consumer Room Air Cleaners and Equivalent Air Changes per Hour, January 2026, the source for the 1.55 times smoke CADR formula and for the CDC figure of at least five air changes an hour
- Fellowes AeraMax 200 manual and the AeraMax 190 manual, the source for both stating 18 square metres against different imperial figures
- Fellowes AeraMax support FAQ, the source for the 42, 50 and 60 dB noise figures, the grouping of the 90, 100 and DX5, the UL certification claim, the ozone testing statement and the instruction for switching PlasmaTRUE off
- Fellowes AeraMax catalogue, checked on 6 August 2026 and listing only commercial models
- WebstaurantStore, AeraMax 90, the source for the “no longer available” statement
- Home Depot, True HEPA 9287001 and the carbon 9324001 four-pack, the source for the $23.95 and $16.63 prices used in the running cost
- OfficeSupply.com, AeraMax 90, the source for the UL Listed certification attribute, the China country of origin and the 100 to 200 sq ft retail claim
- CARB list of certified air cleaning devices, searched on 6 August 2026 with no Fellowes and no AeraMax entry. CARB’s separate draft list could not be checked
- CPSC recall API queried on Manufacturer=Fellowes, on ProductName=AeraMax and on a date-bounded air purifier title search, each returning an empty result. The only air purifier recall on CPSC’s public page is an unrelated brand from February 2026
- Stock checked 6 August 2026 at Paper Machines, Clary Business Machines, ASLegal, Staples, Walmart, OfficeSupply, Office Depot, Quill, MyBinding, OfficeCrave, WebstaurantStore, Target, Best Buy, B&H and Home Depot. No Amazon price or stock was confirmed, so none is quoted here
- A UL file number, an ETL or CSA listing, an Energy Star determination, an AAFA record naming this model, Fellowes’ own air changes per hour claim and an importer of record were all searched for and not found. Fellowes publishes its air changes chart as an image, and the Energy Star database could not be checked, so no Energy Star claim is made here in either direction